共 15 条
[1]
AINAMO J, 1978, WHO 1978 TECH REP, P28
[9]
Ramfjord SP, 1959, J PERIODONTOL, V30, P51, DOI DOI 10.1902/JOP.1959.30.1.51
[10]
Schei O., 1959, J PERIODONTOL, V30, P7, DOI DOI 10.1902/JOP.1959.30.1.7